Free online calculators, converters & file tools

Free calculators, converters, and file tools for PDFs, images, audio, video and more. Fast, accurate, no signup required.

100% free
No signup
Runs in your browser

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History

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Calculators

See all 177 tools

Math, finance, health and science calculators with step-by-step working.

Media & Files

See all 36 tools

PDF, image, audio, video and archive tools that never upload your files.

Developer

See all 34 tools

JSON, data, text, security and diff tools for everyday development work.

Design & Web

See all 33 tools

Resize logos for every platform, build favicons and make QR codes.

Image Resizer

29

QR & Barcode

3

Favicon Generator

1

Popular calculators

Loan Payment Calculator

Percent to Decimal Converter

Decimal to Percent Converter

Fraction to Decimal Calculator

Percent to Fraction Calculator

Mixed Number to Decimal Calculator

100% free
No signup
Runs in your browser
280 tools
Formulas shown

Why people trust CalConverters

Accurate

Step-by-step formulas you can verify.

Private

Everything runs on your device. Nothing is sent.

Instant

Results as you type — no waiting.

Bilingual

Full English and Vietnamese.

Frequently asked questions

Is CalConverters free?: Yes — every tool is 100% free with no signup.
Do you store my data?: No. All calculations run in your browser; nothing is sent to a server.
How accurate are the results?: Calculations use high-precision decimal math, and each calculator shows its formula.
Does it work in Vietnamese?: Yes — the whole site is available in English and Tiếng Việt.